Transmission



March 11, 1941. H A, KNOX 2,234,179

TRANSMISSION Filed Oct. 8, 1940 2 Sheets-Sheet 1 @0.` I 1 l l Q \\\\`1 N a l v I I I QI Us k 2 N Q e l 'qs l 5 J L N j 1 N .vlo \b Q R S l f-i INVENToR 'H 'Hurry A Knpx u1 BY ATTORNEYS H. A. KNOX March 11, 1941.

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INVENTOR Patented Mar. 1 1, 1941 UNITED STATES PATENT OFFICE Application October 8,

2 Claims.

1940, Serial No. 360,297

(Cl. 'I4-359) (Granted under the act of March 3, 1883, as amended April 30, 1928; 3700. G. 757) The invention described herein may be manufactured and used by or for the Goverment for governmental purposes, without the payment to me of any royalty thereon. l

The subject of this invention is a transmission intended for heavy vehicles and is an improvement over the transmission shown in my U. S. Patent 2,043,251.

The purpose of the invention is to provide a rugged and compact change-speed transmission mechanism in which all gears are in constant mesh.

The specific nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as shown in the accompanying drawings in which:

Fig. 1 is a sectional view taken on the line I-I l of Fig. 2;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 3;

Fig. 3 is a view of the gearing in side elevation.

Referring to the drawings by characters of reference, there is shown in Fig. 1 a casing 5 having bearings 6-.6 for mounting a drive shaft 1 and bearings 8-8 for mounting a driven shaft 9 parallel with the shaft 1.

The driven shaft 9 carries a plurality of rotatably mounted gears comprising a gear 'III for first speed, a gear II for reverse, a gear I2 for second speed, and a gear I3 for third speed. A clutch I4 slidably keyed on a collar I 5 fixed on the shaft is adapted to selectively engage gears I0 and II and a similar clutch I6 is adapted to selectively engage gears I2 and I3. A pair of gears I1 and I8 respectively for fourth and fth speeds are keyed on the driven shaft between the gear I3 and adjacent bearing 8.

A pair of gears I9 and 20 rotatably mounted on the drive shaft 1 are in constant mesh respectively with the gears I1 and I8. A clutch 2I similar to clutch I4 is adapted to selectively engage gears I9 and 20. A'iixed gear 22 fixed on the drive shaft 1v is in constant mesh with gear I3 and a gear 23 xed on the drive shaft is in constant mesh with gear I2.

Gear 23 (Figs. 2 and 3) also serves to drive 5 gear 2l which is keyed on lan idler shaft 25 mounted in bearings 2li-26. A gear 21 xed on the idler shaft 25 is in constant mesh with reverse gear Il. A gear 28 also xed on the idler shaft 25 is in constantI mesh with an idler gear 29 10 which is rotatably mounted on a stub shaft 30. The gear 29 is in constant mesh with gear I0.

By reference to Fig. 1 it is apparent that clutch 2| on the drive shaft controls the power transmission through fourth and fifth speeds, clutch 15 I6 serves in like manner for second and third speeds, and clutch I4 controls first speed and reverse.

I claim:

1. A transmission embodying a drive shaft, a 2U driven shaft, change-speed gearing connecting the shafts, a forward gear and a reverse gear rotatable on the driven shaft, a clutch for selectively engaging the forward and reverse gears, an idler shaft constantly driven by the drive shaft, a xed gear on the idler shaft in constant mesh with the reverse gear, and an idler gear driven by the idler shaft and in constant mesh with the forward gear.

2. A transmission embodying a drive shaft, a driven shaft, two sets of constant mesh changespeed gearing connecting the shafts, a clutch on the drive shaft for one set of gearing, a clutch on the driven shaft for the other set of gearing, a forward gear and a reverse gear rotatable on the driven shaft, a clutch for selectively coupling the forward and reverse gears to the driven shaft, an idler shaft constantly driven by the drive shaft, a fixed gear on the idler shaft in constant mesh with the reverse gear, and an idler gear driven by the idler shaft and in constant mesh with the forward gear.

HARRY A. KNOX. 

